Those are definitely some odd looking drivers, and perhaps fairly rare too.
Without being able to obtain any parameters, and for a project this large, I'd say testing for Thiele-Small's yourself might be in order. A Woofer Tester 2, or anything similar, would probably provide you with the information you need. However, if Qts is as high as you say it is, banana's statement regarding OB or IB are probably correct. On the other hand, I think I came across some older guy using a pair of these in separate TL's. I think they went up through his attic, if I remember correctly, with the drivers coming out of the walls in his living room.

Hart;ey recommends a fairly small box with no back with stuffing, I think the box is 30"by30"by20". Richard at Hartley, Audio Lab in NOrth Carolina can help you with that. It is his design, otherwise that box is going to be huge.

Originally posted by howard99 Hart;ey recommends a fairly small box with no back with stuffing, I think the box is 30"by30"by20". Richard at Hartley, Audio Lab in NOrth Carolina can help you with that. It is his design, otherwise that box is going to be huge.